#include <stdio.h>

/*统计一个字符串中字母，空格，数字和其他字符的个数*/

void main()
{
    char c;
    int letters=0,space=0,digit=0,others=0;
    printf("Please input some characters\n");
    while((c=getchar())!='\n')
    {
        if(c>='a'&&c<='z'||c>='A'&&c<='Z')
        letters++;
        else if(c==' ')
        space++;
        else if(c>='0'&&c<='9')
        digit++;
        else others++;
    }
    printf("all in all:char=%d space=%d digit=%d others=%d\n",letters,space,digit,others);

}
